<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div> Welcome to PHP Page</div>
    <?php
        // 所有的php相关代码都要写到这里
        // echo 的作用就是向页面当中输入字符串
        echo "<div>Hello World</div>";
    ?>
</body>
</html>